| 摘要 |
A blind rivet comprises a tubular shell and a mandrel comprising a stem and a head, the head in use forming a blind head to the shell to set the rivet. Either the head or the bore of the shell is formed with a plurality of depressions or recesses, the bases of which define a notional circle. If the depressions are formed on the head then the circle has a diameter less than the diameter of the bore. If the depressions are formed on the bore then the circle has a diameter greater than the diameter of the head. |
